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Summary of Quarterly Financial Data (Unaudited) (Notes)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Consolidated Quarterly Financial Information
SUMMARY OF QUARTERLY FINANCIAL DATA (UNAUDITED)
The following table sets forth a summary of the unaudited quarterly results of operations for the years ended December 31, 2018 and 2017 (in thousands, except per share data):
 
Q1
 
Q2
 
Q3
 
Q4
2018
 

 
 

 
 

 
 

Revenues
$
163,267


$
169,987


$
148,795


$
143,855

Costs applicable to sales
99,340


108,246


116,857


116,507

Amortization
30,777


29,459


31,184


37,053

Gross Profit
33,150

 
32,282

 
754

 
(9,705
)
Exploration
6,683


6,429


8,157


4,128

Other operating expenses (General and administrative, Pre-development, reclamation, and other, and Write-downs)
13,029


11,270


15,850


11,239

Income (loss) from continuing operations
691


2,930


(53,044
)
 
468

Income (loss) from discontinued operations
550


—


—

 
—

Net income (loss)
1,241


2,930


(53,044
)

468

Cash provided by (used in) operating activities
15,541


(1,294
)

5,789


72

Capital expenditures
42,345


41,165


39,472


17,805


 
 
 
 
 
 
 
Basic income (loss) per share:









 
Net income (loss) from continuing operations
$
0.00

 
$
0.02

 
$
(0.29
)
 
$
0.00

Net income (loss) from discontinued operations
0.00

 
0.00

 
0.00

 
0.00

Basic
$
0.00

 
$
0.02

 
$
(0.29
)
 
$
0.00

 
 
 
 
 
 
 
 
Diluted income (loss) per share:
 
 
 
 
 
 
 
Net income (loss) from continuing operations
$
0.00

 
$
0.02

 
$
(0.29
)
 
$
0.00

Net income (loss) from discontinued operations
0.00

 
0.00

 
0.00

 
0.00

Diluted
$
0.00

 
$
0.02

 
$
(0.29
)
 
$
0.00



 
Q1
 
Q2
 
Q3
 
Q4
2017
 

 
 

 
 

 
 

Revenues
$
185,554

 
$
149,540

 
$
159,919

 
$
214,585

Costs applicable to sales
114,490

 
102,229

 
101,559

 
121,982

Amortization
38,693

 
30,733

 
32,401

 
44,722

Gross Profit
32,371

 
16,578

 
25,959

 
47,881

Exploration
5,252

 
7,813

 
9,792

 
7,454

Other operating expenses (General and administrative, Pre-development, reclamation, and other, and Write-downs)
13,962

 
11,110

 
12,374

 
15,106

Income (loss) from continuing operations
18,299


(9,995
)

(11,728
)
 
14,349

Income (loss) from discontinued operations
364


(960
)

(4,924
)
 
(6,724
)
Net income (loss)
18,663

 
(10,955
)
 
(16,652
)
 
7,625

Cash provided by (used in) operating activities
43,938

 
24,103

 
37,308

 
91,811

Capital expenditures
23,591

 
37,107

 
28,982

 
47,054

 
 
 
 
 
 
 
 
Basic income (loss) per share:
 
 
 
 
 
 
 
Net income (loss) from continuing operations
$
0.10

 
$
(0.05
)
 
$
(0.06
)
 
$
0.08

Net income (loss) from discontinued operations
—

 
(0.01
)
 
(0.03
)
 
(0.04
)
Basic
$
0.10

 
$
(0.06
)
 
$
(0.09
)
 
$
0.04

 
 
 
 
 
 
 
 
Diluted income (loss) per share:
 
 
 
 
 
 
 
Net income (loss) from continuing operations
$
0.10

 
$
(0.05
)
 
$
(0.06
)
 
$
0.08

Net income (loss) from discontinued operations
—

 
(0.01
)
 
(0.03
)
 
(0.04
)
Diluted
$
0.10

 
$
(0.06
)
 
$
(0.09
)
 
$
0.04